Any of various swallows with squarish or slightly forked tail and long pointed wings; migrate around martinmas.

任何尾巴有点方且成叉形、翅膀长而尖的燕子；大约在圣马丁节前后迁移。

youdao

Any of various swallows with squarish or slightly forked tail and long pointed wings; migrate around martinmas.

任何尾巴有点方且成叉形、翅膀长而尖的燕子；大约在圣马丁节前后迁移。

youdao